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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Operating Activities      
Net cash provided by operating activities $ 166,707 $ 124,956  
Investing activities      
Purchase of vessels, capital improvements and other additions (179,185) (4,144)  
Additions to newbuildings and vessel purchase deposits (15,675) (18,783)  
Proceeds/(payments) from sales of vessels and termination of charters 83,333 (519)  
Net amounts received from/(paid to) associated companies 1,453 (588)  
Proceeds from redemption of available-for-sale debt securities 5,124 0  
Proceeds from capital distribution and divestment from equity securities 0 9,608  
Collateral deposits paid on swap agreements (1,058) (9,300)  
Net cash used in investing activities (106,008) (23,726)  
Financing activities      
Repayment of lease obligation liability (25,377) (24,238)  
Proceeds from issuance of short-term and long-term debt 255,350 252,000  
Repayments of short-term and long-term debt (159,786) (151,668)  
Debt fees paid (2,066) (3,573)  
Repurchase of bonds 0 (68,146)  
Shares issued, net of issuance costs 0 83,428  
Cash dividends paid (53,250) (35,713)  
Net cash provided by financing activities 14,871 52,090  
Net change in cash, restricted cash and cash equivalents 75,570 153,320  
Cash, restricted cash and cash equivalents at start of the period 153,960 224,398 $ 224,398
Cash, restricted cash and cash equivalents at end of the period 229,530 377,718 153,960
Cash, restricted cash and cash equivalents:      
Cash and cash equivalents 223,816 371,852 145,622
Restricted cash 5,714 5,866 8,338
Cash, restricted cash and cash equivalents at end of the period $ 229,530 $ 377,718 $ 153,960